Pump



FIG. 1 is a front perspective view of a pump showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is an elevational view taken from one side thereof, the opposite side being a mirror image of the side shown;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a pump, as shown and described. 